Bashscripts.org

Hi everyone,

I'm trying to script several passes of some SPEC CPU 2000 benchmarks for some research looking into how different processes compete for cache resources on a multi-core system.

I have time scheduled on the target system tomorrow, so I need this resolved quickly.

Here's the problem:

Below is a command, which I have stored in the variable $TASK

Here it is again, with some newlines and indentation to make it more readable:


It does the following:

1. Run "cputrack", counting L2 cache misses, and storing the output in the file sched5_pass1_L2.txt
2. The program that cputrack will track is "runbind", which simply runs a program on processor 0
3. Runbind itself takes the actual benchmark (SPEC CPU's Crafty, a chess program)
4. Finally, "crafty" takes the crafty.in file, which is a series of chess moves for it to compete against

This is where it gets weird

If I run the command on the Bash command line myself, using the exact command from the first CODE block in this post (followed by an ampersand to background it), it works fine. The following output is produced:

HOWEVER, If I run it from withing a bash script using the following command:

it does NOT work. I get the following result:


It appears that in the first case, the "< crafty.in" portion is not seen as an argument, and is instead piped in as desired. However, when running in the script, the "< crafty.in" is treated as an argument, which Crafty doesn't recognize.

Is there some sort of scope issue? Can I place something like parenthesis somewhere to clear up any ambiguities?

Thank you! Your help will be greatly appreciated!

Hi,

try to make it a function instead of a variable:

Thanks for the response, Watael.

Before I could try your method, someone in my group suggested that I simply prefix my command with eval, and it worked!

Now I use: and all is fine!